340 THOMOMYS. 
and region around mouth dusky; feet whitish, but brown of hind 
leg coming well down over ankle and covering part of foot.’ (Merr. 
Le.) 
Measurements. Total length, 196; tail vertebra, 60; hind foot, 28. 
346. cervinus (Thomomys), Allen, Bull. Amer. Mus. Nat Hist., 1895, 
p. 203;4me. 1. Elliot, Syn. N. Am. Mamm., 1901, p. 230. 
CERVINE PocKEeT GOPHER. 
Type locality. Phoenix, Maricopa County, Arizona. 
Geogr. Distr. State of Sonora, Mexico, to southern Arizona. 
Genl. Char. Size large; color pale; rostrum broad, heavy; skull 
large. 
Color. Above fawn, obscured on dorsal region with dusky; 
beneath gray, base of hair plumbeous; blackish area about ears; 
pouches inside white; feet whitish; tail above grayish fawn, paler 
beneath. 
Measurements. Total length, 228; tail vertebrze, 63; hind foot, 
28. Skull: occipito-nasal length, 44; Hensel, 38; zygomatic width, 
26.5; interorbital width, 7; mastoid breadth, 20; median length of 
nasals, 13; lateral length of nasals, 10; width of nasals anteriorly, 5. 
347. perpallidus (Thomomys), Merr., Scien., vitt, 1886, p. 588. 
Elliot, Syn. N. Am. Mamm., 1gor1, p. 229. 
PALE PockEeT GOPHER. 
Type locality. Colorado Desert, San Diego County, southern 
California. 
Geogr. Distr. Lower California, Mexico, Colorado Desert, southern 
California, and northeastward to the Painted Desert, Arizona. 
Genl. Char. Similar to T. clusius (Coues, Proc. Acad. Nat. Scien. 
Phil., 1875, p. 138, Ex. Bridger’s Pass., Rocky Mts.), but tail longer, 
half the length of head and body; color pale. 
Color. Above pale brownish yellow; sides yellowish white; 
beneath white; feet white; tail white for two-thirds the length, tip 
blackish. 
Measurements. Total length, 228; tail vertebrae, 76; hind foot, 
52. Skull: occipito-nasal length, 38; Hensel, 33; zygomatic width, 
23; interorbital width, 7; mastoid width, 19.5; median length of 
nasals, 12; length of upper molar series, 7; length of mandible, 25. 
The Kangaroo Rats, as their name implies, are remarkable for 
the great length of their hind legs and tail, and they progress by 
long leaps exactly similar to those of the animal from which they 
